On Friday 24 June 2011, James Bottomley wrote:
On Fri, 2011-06-24 at 17:51 +0200, Arnd Bergmann wrote:
Yes, I think that is good, but the change needs to be done atomically across all architectures. This should be easy enough as I believe all other architectures that use dma_map_ops don't even require dma_alloc_noncoherent
This statement is definitely not true of parisc, and also, I believe, not true of sh, so that would have to figure in the conversion work too.
As far as I can tell, parisc uses its own hppa_dma_ops, not dma_map_ops, and arch/sh/include/asm/dma-mapping.h contains an unconditional
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
If you want to change parisc to use dma_map_ops then I would suggest adding another attribute for alloc_noncoherent.
Arnd